The mayor said Chicago won’t “be blackmailed into changing our values, and we are and will remain a welcoming City.”

The lawsuit will be filed Monday.

Officials said there are new qualifications for a public safety grant requiring cities to share information with federal immigration authorities. City officials allege those qualifications are unconstitutional.

Chicago received about $2.3 million in such grants last year, which have been used for buying police vehicles.

Asked to comment on Emanuel’s statement, U.S. Department of Justice spokesman Ian D. Prior said via email: “In 2016, more Chicagoans were murdered than in New York City and Los Angeles combined. So it’s especially tragic that the mayor is less concerned with that staggering figure than he is spending time and taxpayer money protecting criminal aliens and putting Chicago’s law enforcement at greater risk.”